Magnetic Fluctuations Near a Helical Reorientation Transition.

Magnetic spin textures are a non-trivial distribution of magnetization vectors in a sample which are promising for future low power computing in part due to their topological protection. A popular material that hosts these spin textures is FeGe which shows a wide range of various spin textures at relatively high temperatures. In this talk, I will focus on the amorphous counterpart of this material and investigate the phase transition pathway between a disordered helical phase and a paramagnetic phase. As a result of the unique energy landscape provided by the amorphous nature of our sample, we find that the helical propagation direction reorients from being purely in-plane to canted out-of-plane and is mediated by the production of topological defects. By using coherent soft X-ray scattering, we were able to investigate the magnetic fluctuations as this helix reorients.